<template>
  <div class="login-container">
    <el-form ref="registerForm" :model="registerForm" class="login-form" auto-complete="on" label-position="left">
      <h3 class="title">智能控制课题组文献管理平台</h3>
      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input v-model="registerForm.username" name="username" type="text" auto-complete="on" placeholder="请输入用户名" @input="inputValidate()"/>
      </el-form-item>
      <span  :style="{'color': tipColor}" v-text="usernameTips"></span>
      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :type="pwdType"
          v-model="registerForm.password"
          name="password"
          auto-complete="on"
          placeholder="请输入密码"/>
        <span class="show-pwd" @click="showPwd">
          <svg-icon icon-class="eye" />
        </span>
      </el-form-item>

      <el-form-item prop="realName">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input v-model="registerForm.realName" name="realName" type="text" auto-complete="on" placeholder="请输入真实姓名" />
      </el-form-item>
      <el-form-item>
        <el-button :loading="loading" type="primary" style="width:100%;" @click.native.prevent="handleRegister">
          注册
        </el-button>
      </el-form-item>
      <div class="tips">
        <span style="margin-right:20px;">已有账号，<a @click="toLogin()">点击登录</a></span>
      </div>
    </el-form>

  </div>
</template>

<script>
  import * as loginApi from '@/api/login'
  export default {
    name: 'Login',
    data() {
      return {
        //注册表单信息
        registerForm: {
          username: '',
          password: '',
          realName: ''
        },
        loading: false,
        pwdType: 'password',
        redirect: undefined,
        //用户名状态提示信息
        usernameTips: '',
        //用户名状态提示颜色
        tipColor: '',
        //能否注册标志位
        couldRegister: false
      }
    },
    watch: {
      $route: {
        handler: function(route) {
          this.redirect = route.query && route.query.redirect
        },
        immediate: true
      }
    },
    methods: {
      //跳转到登陆页面
      toLogin() {
        window.location.href = "/login"
      },

      //实时监测输入的用户名在数据库中是否存在
      inputValidate() {
        let username = this.registerForm.username;
        if(username === '' || username === undefined || username.trim() === ''){
          this.usernameTips = '请输入用户名'
          this.tipColor = 'red'
        }else{
          //向后台发请求判断该用户名是否存在
          loginApi.isAvailableUsername(this.registerForm.username)
            .then(response => {
              if(response.data.code === 20000) {
                this.usernameTips = '此用户名可以使用'
                this.tipColor = 'green'
                this.couldRegister = true
              }
              else {
                this.usernameTips = '此用户名已被使用'
                this.tipColor = 'red'
              }
            })
            .catch()
        }
      },

      //提交注册请求
      handleRegister() {
        if(this.couldRegister) {
          loginApi.register(this.registerForm)
            .then(response => {
              console.log(response);
              if(response.data.code === 20000) {
                this.$message({
                  type: 'success',
                  message: '注册成功！'
                });
                window.location.href = "/login"
              }
            })
            .catch()
        }
      },

      //显示密码
      showPwd() {
        if (this.pwdType === 'password') {
          this.pwdType = ''
        } else {
          this.pwdType = 'password'
        }
      },
    }
  }
</script>

<style rel="stylesheet/scss" lang="scss">
  $bg:#2d3a4b;
  $light_gray:#eee;

  /* reset element-ui css */
  .login-container {
    .el-input {
      display: inline-block;
      height: 47px;
      width: 85%;
      input {
        background: transparent;
        border: 0px;
        -webkit-appearance: none;
        border-radius: 0px;
        padding: 12px 5px 12px 15px;
        color: $light_gray;
        height: 47px;
        &:-webkit-autofill {
          -webkit-box-shadow: 0 0 0px 1000px $bg inset !important;
          -webkit-text-fill-color: #fff !important;
        }
      }
    }
    .el-form-item {
      border: 1px solid rgba(255, 255, 255, 0.1);
      background: rgba(0, 0, 0, 0.1);
      border-radius: 5px;
      color: #454545;
    }
  }

</style>

<style rel="stylesheet/scss" lang="scss" scoped>
  $bg:#2d3a4b;
  $dark_gray:#889aa4;
  $light_gray:#eee;
  .login-container {
    position: fixed;
    height: 100%;
    width: 100%;
    background-color: $bg;
    .login-form {
      position: absolute;
      left: 0;
      right: 0;
      width: 520px;
      max-width: 100%;
      padding: 35px 35px 15px 35px;
      margin: 120px auto;
    }
    .tips {
      font-size: 14px;
      color: #fff;
      margin-bottom: 10px;
      span {
        &:first-of-type {
          margin-right: 16px;
        }
      }
    }
    .svg-container {
      padding: 6px 5px 6px 15px;
      color: $dark_gray;
      vertical-align: middle;
      width: 30px;
      display: inline-block;
    }
    .title {
      font-size: 26px;
      font-weight: 400;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
    .show-pwd {
      position: absolute;
      right: 10px;
      top: 7px;
      font-size: 16px;
      color: $dark_gray;
      cursor: pointer;
      user-select: none;
    }
  }
</style>
